Moderation

Bracket

• B1 Exhibition — allowed: No restriction at this bracket
• B2 Core — allowed: No restriction at this bracket
• B3 Upgraded — allowed: No restriction at this bracket
• B4 Optimized — allowed: No restriction beyond the banned list
• B5 cEDH — allowed: No restriction beyond the banned list

Why

• No Game Changer, mass land denial, extra turn, tutor or two-card combo

How Lotus Vault estimates a bracket

Bracket: Lotus Vault analysis, with Commander Spellbook flags

Combos

9 known combos.

• Knowledge Pool + Moderation + Zedruu the Greathearted
  Produces: Exile all spells target opponent casts from their hand, Target opponent can only cast one spell per turn, Lock
  View on Commander Spellbook
• Knowledge Pool + Moderation + Fractured Identity
  Produces: Exile all spells opponents cast from their hands, Opponents can only cast one spell per turn, Lock
  View on Commander Spellbook
• Knowledge Pool + Moderation + Harmless Offering
  Produces: Exile all spells target opponent casts from their hand, Target opponent can only cast one spell per turn, Lock
  View on Commander Spellbook

Combos: Commander Spellbook

Rulings

• 2021-06-18 · Wizards of the Coast
  Moderation's triggered ability works only while it's on the battlefield, so it doesn't let you draw a card when you cast it.
• 2021-06-18 · Wizards of the Coast
  If an effect says you can't cast spells, and another effect instructs you to cast a spell, such as that of the ability that triggers when you remove the last time counter from a card with suspend, you won't be able to cast that spell.
• 2021-06-18 · Wizards of the Coast
  If you cast Moderation, you've already cast at least one spell that turn (Moderation itself) so you won't be able to cast any more spells until the next turn. If Moderation comes under your control on a turn you haven't cast any spells, you'll be able to cast one spell that turn.

Rulings: Scryfall · Wizards of the Coast